May 15, 2018 Detailed Ranitidine dosage information for adults and children. Applies to the following strengths: 150 mg; 300 mg; 75 mg; 15 mg/mL; 25 mg/mL; 1 mg/mL; 25 mg -Intermittent IV bolus injections should be diluted up to 2.5 mg/mL in some hospitalized patients who are unable to take oral...